Hydroponic seed trays
Two Hortiblock 288 / 20 ml white styrofoam seed trays used in hydroponic growing of tobacco plants before they are planted in the fields. The trays keep the young plant in neat uniform rows as it floats on nutrient-rich water.
Carla (Oliveira) Cassone’s description
Origin: Acheson, Alberta, Canada
Creator: Beaver Plastics, Ltd.